How about this then as a sort of unifying theory for the Creationist and Scientific sides of the argument..

What is the purpose of life?    To propagate itself as far and wide as possible.

If there is a creator how does it propagate itself, being a solitary, all encompassing life form.    Big Bang,  throwing out another iteration of itself, a universe similar but not identical to the one it exploded from.  

This would also explain why there are so many versions of the creator in existence.  The different beliefs are "in touch" with different versions of the creator in different universes.